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 General Eye Care

Nearsightedness

Nearsightedness

Visual acuity test
Visual acuity test
Normal, near, and farsightedness
Normal, near, and farsightedness
Lasik eye surgery - series
Lasik eye surgery - series

Definition:

Nearsightedness is when the eyes focus incorrectly, making distant objects appear blurred.

Alternative Names:
Myopia; Shortsightedness

Nearsightedness affects males and females equally. Those with a family history of nearsightedness are more likely to develop it. Most eyes with nearsightedness are entirely healthy, but a small number of people with myopia develop a form of retinal degeneration.

Causes, incidence, and risk factors:

A nearsighted person sees near objects clearly, while objects in the distance are blurred. As a result, someone with myopia tends to squint when viewing far away objects. This characteristic is the basis of the word "myopia," which comes from two Greek words: myein, meaning shut, and ops, meaning eye.

A nearsighted person can easily read the Jaeger eye chart (the chart for near reading), but finds the Snellen eye chart (the chart for distance) difficult to read. This blurred vision results when the visual image is focused in front of the retina, rather than directly on it.

Nearsightedness occurs when the physical length of the eye is greater than the optical length. For this reason, it often develops in the rapidly growing school-aged child or teenager, and progresses during the growth years, requiring frequent changes in glasses or contact lenses. It usually stops progressing as a person finishes growing in his or her early twenties.

Seeing
Seeing
Symptoms:
  • Blurred vision or squinting when trying to see distant objects (children often cannot read the blackboard, but can easily read a book)
  • Eyestrain
  • Headaches (uncommon)
Signs and tests:

A general eye examination, or standard ophthalmic exam may include:

  • Measurement of the pressure of fluid in the eyes
  • Refraction test, to determine the correct prescription for glasses
  • Retinal examination
  • Slit-lamp exam of the structures at the front of the eyes
  • Test of color vision, to look for possible color blindness
  • Tests of the muscles that move the eyes
  • Visual acuity, both at a distance (Snellen), and close up (Jaeger)

Review Date: 11/13/2007
Reviewed By: Manju Subramanian, M.D., Assistant Professor in Ophthalmology, Vitreoretinal Disease and Surgery, Boston University Eye Associates, Boston, MA. Review provided by VeriMed Healthcare Network.

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